The Luhrs v. Hancock case in 1900 revolved around a dispute over land ownership and the validity of Spanish land grants in Arizona. The plaintiff, George H.N. Luhrs, claimed that he had purchased the disputed property from its original owners who held it under a Mexican grant confirmed by Congress after the Treaty of Guadalupe Hidalgo (1848). However, defendant John Hancock argued that his claim to the same property was valid based on an older Spanish grant which predated Mexico's independence from Spain and thus superseded any subsequent claims. The Supreme Court ruled against Luhrs stating that only those Spanish or Mexican land grants recognized by Congress were legally binding according to U.S law following territorial acquisitions after the war with Mexico. Therefore, since there was no evidence showing Congressional recognition of this specific old Spanish grant referred to by Hancock, his claim was deemed invalid while upholding Luhurs' title as legitimate.

The dissenting opinion in the Luhrs v. Hancock case argued that the majority's decision was incorrect because it failed to properly interpret and apply Arizona territorial law regarding property rights. The dissent contended that under this law, a person who improves upon a piece of land with the belief they are its rightful owner should not be penalized if it is later discovered they do not legally own it. Instead, such individuals should be compensated for their improvements or allowed to purchase the land at its unimproved value from whoever is determined to be the legal owner. In contrast, by ruling in favor of Hancock (the legal owner), without requiring him to compensate Luhrs (who had made significant improvements on what he believed was his property), the majority effectively rewarded Hancock for another's labor and investment while punishing Luhrs despite his good faith efforts. This interpretation contradicted both equitable principles and existing territorial laws designed specifically to prevent such outcomes.